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(2x * 5x + 1) - (3 * x^2 -1) = 6
(10x^2 + 2x) - (3x^2 - 3 ) = 6
10x^2 + 2x - 3x^2 + 3 = 6
7x^2 + 2x + 3 = 6
7x^2 + 2x + 3 - 6 = 0
7x^2 + 2x - 3 = 0
jadi a=7, b=2, c=-3
bentuk umum persamaan kuadrat = ax^2 + bx + c = 0
rumus perkalian akar-akar kuadrat x1 dikali x2 = c per a
dimana c = -3 dan a = 7
jadi x1 * x2 = c / a = - 3 / 7
cuman ini jalan yg aku tau :) semoga sedikit membantu